Calling device.



0. F. FOR'SBERG.

CALLING DEVICE.

APPLICATION FILED MAR.9. 191s.

1,161,85, Patented Nov. 30, 1915.

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CALLING DEVLCE.

APPLICATION FILED MAR. 9, I9l5. 1,161,854.

Patented Nov. 30, 1915.

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CALLING DEVICE. APPLICATION FILED MAR. 9. 1915.

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0. F. FORSBERG.

CALLING DEVICE.

APPLICATION FILED MAR. 9, I915. 1,161,854, Patented Nov. 30, 1915.

4 SHEETS-SHEET 4- W/f'nesses:

ED'VSTATE'S PATENT oFFIoE.

OSCAR F. 'FORSBERG, YONKERS, NEW YORK, AS SIGNOR TO WESTERN ELECTRICCOMPANY, OF YORK, N. Y., A CORPORATION OF ILLINOIS.

CALLING DEVICE.

To all whom it may concern:

1 Be it lmown that I, OSCAR and more particularly to impulse senders forautomatic or semi-automatic telephone systems in which the selectorswitches used for the building up of a connection are directivelycontrolled by current impulses sent from a subscribers station or anoperators position.

' The object of this invention is-to provide a new and-improved callingdevice which is simple in construction which may be readily assembled,and in whlch the adjustable parts can be reached without the necessityof dismantling the device.

Other new and useful features of this invention will appear from thefollowing detail description and the appended claims.

Inthe drawings, Figure l is a plan view of the calling device; Fig. 2 isa side elevation thereof; Fig. 3 isa bottom view thereof Fig. 4: is asectional view on lines 44 of Fig. 5; Fig- 5 is a sectional view onlines 5-5 of Fig. 4; Fig. 6' is a perspective view {of the difierentparts of the calling device before assembly; Fig. 7 shows thespeedgoverning mechanism in its normal position, the view being taken onlines 77 of Fig. 8; Fig. 8 isa sectional View of the speed governingmechanism the view being taken on'lines 88 of Fig. 7; Fig. 9 is a viewcorresponding to Fig. 7, showing the speedgoverning-mechanism in itsactuated position. Y

The diflerent parts of the calling device are held together by means ofa shaft 1. At one end shaft 1 has an enlarged portion forming ahead 2. Adial 1 is fastened to an enlarged portion 3 of shaft 1. The dial maybe'actuated by means offinger holds 5 provided around its periphery.

In the center of dial 4: is fastened a plate 6 on which the necessaryinstructionsas to the handling of the device may be engraved or printed.Head 2 of shaft 1 is positioned in the cavity formed between plate 6 andthe dial 4., and the user is thus prevented fromdismantling the device.Fastened to Specification of Letters Patent. Application filed March9,1915. Serial No. 13,126.

F. FoRsBERo,'a citizen of the United States, residing at.

Patented Nov. 30, 1915.

a plate 7 is a ring 8 carrying characters, such as numerals .1 to 0,each of said characters corresponding to one finger hold 5. The properspacing between dial 1 and the rmg 8 s insured by a ring 9. The plate 7has a cup-shaped portion 10 projecting through rmg 8'and ring 9, andsaid plate is carr1ed on and arranged for rotation with portion 3 ofshaft 1. WVithin said cupshaped portion10 is a drum llalso engagingportion 3 of shaft 1 and carrying an impulse wheel 12 and a'gear wheel13 held together by means of a stud 1 4. Dial 4,

plate 7 and drum 11, with the parts carried by them, are clamped betweenhead 2 of shaft 1 and a nut 15 adapted to engage a screw-threadedportion 3 of shaft 1. Below nut 15, motor spring 16 is provided, one

end of which is secured to the shaft by engaging one of several slots innut 15, and the other end to a base 17. Shaft 1 extends through a hub 19secured to base 17. To screw-threaded end 20 of shaft 1 is fastened, bymeans of a nut 21, an arm 22 carrying a roller 23 of insulatingmaterial." It will be seen, therefore, that all the operating parts ofthecalling device are held together by a single screw-threaded means, i.e. nut 21. By unscrewing nut' 21 the device may be taken apart. Sincethe device is preferably mounted in a telephone desk or wall set,

the user does not have access to nut 21 and is unable to tamper with theadjustment of the apparatus. 4

Extending through an opening 24 of base 17 and pivoted betweenprojections 25 of base 17 is a pawl 26. One arm 27 of'said pawl isadapted to be engaged by the teeth of impulse wheel 12, and another arm28 of pawl 26 extends outside of base 17 and carries a roller 29 ofinsulating material. Roller 29 is adapted. to actuate contact spring 30cooperating with contact spring 31 suitably mounted on but insulatedfrom the outside of the base 17. Contact springs 32 and 33, which arealso mounted on the outside of base '17, are normally maintained open byroller 23 engaging contact spring 33. A coiled spring 31 tends to keeppawl 26 in its normal position, i. c. with roller 29 out of engagementwith contact spring 30 and with the arm 27 in the path of the teeth. ofthe impulse wheel 12.

Projecting outward from base 17 is a cup 35." Mounted on the innersurface of base ed on studs 43 and 44, respectively. Friction member 45carries a leaf spring 47,

. and friction member 46 a leaf spring 48. A

substantially S-shaped member 49, loosely mounted on spindle 37 beneathbridge-piece 42, engages, by means of its arms 50 and 51, the free endsof leaf springs 47 and 48, respectively. By means of a screw 52 extending from bridge-piece 42 through an opening 53 of the S-shaped member49, this member may be fixed in various positions I so as to adjust thetension of leaf springs spring 16.

plnion causes a spindle 56, journaled be- 47 and 48. As shown in Fig. 3,openings are provided in thebottom of cup 35, through which free accessmay be had to screw 52 to permit the governor to be readily adjustedwithout disturbing the other parts of the calling device. The leafsprings tend to maintain friction members 45 and 46 111 the positionshown in Fig. 7'.

Other details of construction will be understood from the followingdescription of the mode of operation of the device.

If the user desires to send out, for instance, a signal corresponding tothe number 3, he engages with his'finger the finger hold 5 oppositewhich numeral 3 appears, and rotates the dial in a clockwise directionuntil a stationary stop 54 is reached. In response to the actuation ofdial 4, shaft 1, plate 7 and the ring 8 carried thereby, drum 11 and theimpulse wheel 12 and gear-wheel 13 provided thereon, are rotated in aclockwisedirection. Nut 15 is also rotated with shaft 1 and causes thewinding up of motor Gear-wheel 13 meshing with a tween bridge 36 andbase 17, to rotate in a counter-clockwise direction. Fastened .tosplndle 56 is .a gear-wheel 57 which transmits the motion of gear-wheel13 to pinion 38 of the speed-governing mechanism, and rotates spindle 37of the governor in a clockwise direction. The ratchet wheel 39 slides bythe pawl 40 pivoted on stud 43, thereby allowlng pinion 38 and spindle37 to rotate in a clockwise direction, the friction members 45 and '46remaining in the position shown in Fig. 7. It will be seen thereforethat the governor does not operate or exert any speed controlling actionwhile the dial is being set by rotation in'a clockwise direction.

During the forward rotation of impulse wheel 12, arm 27 of pawl 26 isvibrated by the ratchets of the impulse wheel, but arm 28 of pawl 26 ismoved from contact spring 30 and therefore does not cause the openingand closing of the contact springs 30 and31.

When dial 4 was moved out of its normal position, roller 23, whichnormally keeps contact springs 32 and 33 open, allowed said contactsprings to close. Contact springs 32 and 33 may be connected to theoperators telephone set in such a manner as to shortcircuit it whilesignaling impulses are being sent.

When the user releases dial 4, z. e. removes his finger from the engagedfinger hold, shaft 1 and the elements fastened thereto are rotated in acounter-clockwise direction by the power stored up in motor spring 16.Impulse wheel 12 now vibrates arm 27 of pawl 26 but in a direction tocause arm 28 to engage spring 30, and thereby to open and close thecontact between springs 30 and 31. In the device shown, in signaling thenumber 3, said springs will be opened and closedthree times resulting inthe sending out of three impulses which may serve to govern a switch inits selective movement in a well-known manner.

Gear-wheel 13, being rotated in a counterclockwise direction, causesspindle 37 f the speed-governing mechanism to rotate also in. acounter-clockwise direction. Springpressed pawl 40 now engages ratchetwheel 39, and as this pawl is pivoted at 43 it causes bridge-pieces 41and 42 to rotate in a counter-clockwise direction. Due to thecentrifugal force, friction members 45 and 46, which rotate with saidbridge-pieces, fly outwardly against the tension of leaf springs 47 and48, and press the rubber studs 45 and 46 against the wall of cup 35. Dueto the friction between studs 45 and 46 and the wall of cup 35, thereturn movement of shaft 1, and thereby that of impulse wheel 12, isreduced to a speed predetermined by the adjustment of leaf springs 47and 48. When shaft 1 and therefore thewhole mechanism reach their normalposition, roller 23 again engages contact spring 33, thereby openingsaid contacts and removing the shunt around the users telephone set.

As shown in Fig.3, a terminal strip 65, to which the line conductors areconnected, is provided on the outside surface of base 17.

Although in the claims the movable setting member of the calling deviceis referred to as a dial, it will be apparent that this invention isapplicable to impulse senders which are set by manually movable membersof; widely varying character.

What is claimed is:

1- Ina calling device, a rotatable shaft, a

. dial carried thereby and having a plurality of finger holds, a platecarrying digit characters designating said finger holds, an impulseWheel on said shaft,'a gear wheel on said shaft cooperative contactsadapted to be actuated by said impulse wheel in ac cordance with therotation of the shaft, a governing mechanism driven from said gearwheel, and a single clamping means for maintaining said'shaft, dial,plate, and impulse and gear Wheels in their normal position in relationto each other.

2. In a calling device, a rotatable shaft, a dial carried thereby andhaving a plurality of finger holds, a plate carrying digitcharacters'designating said finger holds, an impulse wheel and a gearwheel on said shaft, cooperative contacts adapted to be actuated by saidimpulse wheel in accordance with the rotation of said shaft, a governingmechanism-driven from said gear wheel, and a single screw-threaded meansapplied to the shaft for maintaining said shaft, dial, plate, andimpulse and gear wheels in their normal position in relation to eachother.

3. Ina calling device, a rotatable shaft, a dial carried thereby andhaving a plurality of finger holds, a plate carrying digit charactersfor designating said finger holds, an

impulse wheel and a gear wheel on said shaft, a base, a singlescrew-threaded means for maintaining said shaft, dial, plate, and

impulse and gear Wheels in their normal position in relation to eachother, a single clamping means for maintaining said shaft and said basein their relative normal position, a governor mounted ;on said base anddriven from said gear Wheel, cooperative contacts, and means controlledby said impulse wheel for actuating saidcontacts in accordance with therotation of said shaft.

4. In a calling device, a rotatable shaft, a dial carried thereby andhaving a plurality of finger holds, a member carrying digit charactersfor the designation of said finger holds, a platecarrying said member, acupshaped portion for said plate, an impulse Wheel carried Within saidcup-shaped portion, a single screw-threaded means for maintaining saiddial, shaft, plate and impulse wheel in their relative normal posi tion,and contacts actuated by said impulse wheel in accordance with therotation of said shaft.

In Witness whereof, I hereunto subscribe my name this 8th day of March,A. D. 1915.

OSCAR F. FORSBERG.

Witnesses: E. EDLER,

K. L. STAHL.

